EP0048683A1 - Method and apparatus for the purification of pollutant residues - Google Patents

Abstract

The invention relates to a method and a device for cleaning dirt residues, in particular gaseous, liquid and pasty residues. In addition to separating these residues, this purification also carries out their biological conversion. The residues are passed through a biological filter in which three fermentation steps are carried out, namely an aerobic (25), an anaerobic (26) and finally an aerobic (27) fermentation. The process produces a fuel as the end product.

Description

The invention relates to a method for cleaning dirt residues, in particular gaseous, liquid and pasty residues, and a device for carrying out this method.

The cleaning devices known hitherto can be divided into two groups: a) those which restrict themselves to a physical separation of the constituents of the dirt residues, and b) those which, in addition to this separation, achieve a biological conversion of the product to be cleaned.

The first group includes all filtering devices in which the filter carrier cannot be changed and can consist, for example, of a porous mass such as sand, and physical separating devices such as electrostatic precipitators.

The second group includes wastewater treatment plants in which a fermentation process and a decanting separation process are carried out, these processes being able to be combined with a filtering phase. During the decanting phase, a sludge remains, the removal of which is a major problem today.

In all the cases mentioned above, only the treatment of the product to be cleaned is provided, and the result is the solid, liquid or gaseous substances which form part of this product and which can practically not be used. At most, the treatment of wastewater produces a sludge that can be used as a fertilizer after drying.

On the other hand, the high cost of construction and maintenance of the conventional cleaning equipment in many cases means that it is not used, and even after construction, residues are released to the environment without prior treatment, resulting in pollution of the environment.

It is the object of the present invention to provide a method and a corresponding device with which the cleaning of dirt residues can be carried out with the use of a biological filter, which consists of a filter carrier or a filter mass of organic nature, which is biologically attacked and during the filtering of the residue to be cleaned is converted, which is also biologically attacked and converted, all of which is done in order to finally obtain a product which consists of the converted filter carrier and the cleaned residue and which can finally be used advantageously as fuel.

In this way, the method according to the invention not only gives the residues cleaning but also a solid product which can be used and whose high value makes the device profitable.

The dirt residues to be cleaned can be gaseous - for example from industry -, liquid - for example waste water from livestock farms etc. - or pasty, which can be the case with sewage treatment plants, for example.

Another object of the invention is to provide a method and apparatus for cleaning debris with which the liquid products can be removed, either as liquids or as steam, during cleaning, without creating bad odors or any contamination .

Furthermore, it is an object of the invention to provide a method for cleaning dirt residues in which usable fuel gases are produced.

According to the invention, the gaseous, liquid or pasty dirt residues to be cleaned are passed through a biological filter, the filter carrier of which consists of a mass of organic origin with different sections or types of accelerated fermentation. The mass that forms the filter carrier can consist of vegetable residues, for example wood waste, or of garbage or garbage and wood waste mixtures. This possibility makes the method according to the invention very valuable, since it permits the use and disposal of waste from towns and cities which present many problems today. In this case, the method according to the invention can be used with the sole task of eliminating the waste, and in addition an end product is obtained which can be used as fuel.

The various fermentation steps are triggered in the filter carrier with cultures of microorganisms, for example bacteria, fungi, etc., which have previously been prepared so that they are resistant to the dirt residues to be treated with them.

It is clear that the microorganisms which initiate and maintain the fermentation must be resistant to the medium in which they have to live and that they must also be able to bring about the decomposition and purification of the residues. It is therefore necessary to cultivate these microorganisms beforehand in such a way that they adapt to the medium in which they will live. As soon as the microorganisms that are resistant to a certain type of dirt residue are obtained, you already have the basis for their treatment and cleaning.

It can happen that the strains used in the method according to the invention for a certain type of dirt residue degenerate continuously and become unsuitable for the work of the filter. In this case it would be necessary to renew the cultures.

The microorganisms used must be able to decompose the dirt residues and the mass that forms the filter body, converting them into solid products that can be used as fuels, harmless liquid products that are removed in liquid or gaseous form can, and in flammable or non-polluting gaseous products.

According to the invention, the filter body has three successive fermentation sections, the aerobic fermentation taking place in the first and the third, while anaerobic fermentation takes place in the second.

Air from the atmosphere is introduced into the first and third sections to ensure aerobic fermentation, while from the second Section gases and liquids are withdrawn, all working together to maintain temperatures.

The first and third fermentation steps also act as filters for the gases and liquids that can develop in the second section, thereby ensuring that their possible removal takes place without bad smells.

The gases that are drawn directly from the second fermentation section and that are the ones that can develop bad smells contain high percentages of combustible gases, which is why they can be directed to a chamber for combustion or use after they have been properly treated.

The mass that forms the filter support is constantly renewed by gradually passing it from the first fermentation step to the second and from this to the third, where it is finally drawn off together with the cleaned residue after it has been formed. At the same time, new filter mass has already been introduced into the first fermentation section, as a result of which a continuous process is achieved. At the same time that the filter carrier is being replaced, the dirt residue to be cleaned is added. It can be fed to the fermentation section or the second section.

The speed of renewal of the filter carrier together with the residues to be cleaned is such that the complete decomposition of the residues and the maintenance of the living conditions for the bacteria in the three fermentation sections are guaranteed.

In order to maintain adequate oxygen supply conditions in the first and third fermentation steps, gas outlets and direct connections to the atmosphere can be provided.

It is clear that between the zones of the filter carrier which correspond to the three fermentation steps there are transition zones in which the conditions gradually change in the range of the values which correspond to the limit states.

The liquid products that are created in the second fermentation step are partly withdrawn in vapor form together with the gases that are developed in this area, and partly in liquid form by draining or suction.

The three fermentation steps can be carried out together or separately, depending on the environmental conditions, the properties of the residues to be cleaned, the nature of the filter carrier, the desired cleaning speed, etc.

The three fermentation steps can thus be carried out together in a container in which the first and third fermentation sections occupy the outer zones of the container, while the second fermentation step takes place in the middle part. The three sections are preferably divided vertically, the first step taking place at the top and the third step at the bottom. In this way, the filter carrier can be released together with the cleaned residues by gravity, new mass for the filter carrier being introduced into the upper part of the container and the residues to be cleaned being added at the most suitable point. For example, when cleaning gases, the same can be introduced into the second fermentation section, the first and the third section as cleaning Filters for the gases that pass through these sections, so that they are released to the environment without bad odor. If the residues to be cleaned are liquid or pasty, they can be mixed with the mass of the filter carrier which is added over the first section. They can also be added to the second section.

The three fermentation steps can also be carried out in separate containers. The first aerobic fermentation step would take place in a first container, from where the filter mass would be fed to a second container, where the anaerobic fermentation would take place and from where the mass would be supplied to a third container for the third aerobic fermentation step. The addition of residues, the removal of gases and liquids, the monitoring of the fermentation conditions, etc. would be carried out in the form already outlined.

Finally, there remains the possibility that the first fermentation step and the beginning of the second take place outdoors, after which the filter carrier together with the residues to be cleaned are fed to a container, where the second step would be completed and the third would be carried out. It would also be possible to do all three steps outdoors.

According to a further aspect of the invention, after the completion of various fermentation steps or at least after some of them, the separation of foreign bodies such as stones, metal objects, glass etc. is carried out, which are contained in the material that forms the filter carrier or in the residues to be cleaned can. The deposition of such Frendkörper after the three F _e rmentationsschritten or part thereof represents a great advantage, particularly when the Filter carrier consists entirely or partially of garbage, since under these conditions the material that forms the filter carrier is already broken up into small particles or can easily be broken up with little energy, so that the non-split objects can be separated by sieving or density differences, what will be described below.

As soon as the filter carrier and the dirt residues have passed through the various fermentation steps and the separation of foreign bodies has been carried out, the product is subjected to a grinding process, which is facilitated by the state in which the product is located, since the product is easily broken up by the fermentations can be.

The milled product is an excellent fuel that can be briquetted after drying to reduce its moisture level so that it can be used as a fuel.

Instead of briquetting, a powder can be produced from the ground and dried product, which can advantageously be used as an inflatable fuel.

As already mentioned, the three fermentation steps or a part thereof are carried out in a preferably cylindrical container with a vertical axis, the base of which is open and the upper end of which is closed. In this container the material constituting the filter carrier is introduced through an inlet provided in its upper, closed end. The residue to be purified can be added to this material or can be fed separately to the container at the appropriate fermentation section. The container can be loaded with a Conveyor belt, bucket conveyor, pneumatic conveyor, etc. take place. A mill with a sieve attached to it can be provided in the conveyor device in order to grind and separate bodies with relatively large dimensions such as plastic bags, bottles etc.

According to the invention, the container is held by supports or outer support feet, which end around the container at radially spaced apart points. Beneath the container there is a support base on which the filter support lies and which does not extend to the wall of the container, so that an annular opening is formed between the two, through which a radial screw is guided, which is displaced angularly over said opening. The support base has a central opening, which serves as an outlet opening and to which a discharge line is connected at the bottom, which works pneumatically with suction.

The inner end of the screw rests on a rotary bearing which is attached in the middle part of the outlet opening for the product. With its outer end, the screw is connected to a drive mechanism, which causes its rotation and angular movement.

Under these conditions, the screw moves over the filter mass at the point where it protrudes over the lower edge of the container and ends at the support base. The rotation of the screw pushes the filter mass up to the central outlet opening, which is provided in the support base, from where it is carried along by the extraction path. At the same time, the angular movement of the screw causes it to be moved over the entire support base and constantly attacks an edge of the filter mass which is directed to the central outlet opening. If the snail encounters excessive resistance when it moves angularly, the motor of the drive mechanism, which causes the angular movement, is below a predetermined value, so that when this value is exceeded, the mechanism slips due to the resistance, so that the worm only rotates in this case, it does not convey any material to the outlet opening and even that Obstacle removed to continue the angular movement.

In order to prevent blockages from occurring in the central outlet opening, an air inlet channel is provided which runs vertically through the interior of the container, namely in its central part, and which penetrates the wall at the top and ends immediately above the central outlet opening. In this way, the air that is drawn in from the discharge path and comes out of the outlet opening passes through the central tube and also through the opening that opens the screw, constantly taking with it the product that moves the screw to the central outlet opening.

radial The support feet of the container are / so far away from the support base that there is space for a circular path on which the drive mechanism of the screw is mounted and can move.

According to the invention the container is apart with a number of vertical tubes provided by the above-mentioned central tube, such as the central pipe pass through the said upper, closed end of the container, but only up to the heights range, rmentationsschritten the different F _e correspond. The tubes, which extend to the sections of the aerobic fermentation, serve to allow air to enter these sections. In contrast, the tubes, which reach the level of the anaerobic fermentation, serve for the escape of gases and vapors. These pipes allow to regulate the oxygen supply and the temperature in the different sections. Some of the tubes, which extend to the zone of the anaerobic fermentation, can be extended downwards with an inclined channel, the latter leading laterally out of the container and being able to drain off liquids.

The pipes mentioned, which extend to the zone of the anaerobic fermentation, can also be closed at their lower ends so that the liquids can be collected and sucked off from time to time.

The various pipes are provided with valves and radial openings rmentationszone within the F _e, they are associated, are at different heights.

A chamber for the separation of heavy particles such as stones, metal objects, glass pieces etc. is provided in the draw-off section. All of the organic material from which the filter carrier is made, together with the cleaned residues, has, after going through the three fermentation steps, a much lower density than the particles or objects which can be contained in this organic material and which consist of mineral substances with organic components can, whereby they have not been implemented by the fermentation due to their size. The aforementioned separator uses this difference in density to remove the particles or objects.

According to the invention, the separator consists of a chamber which is arranged under the pneumatic discharge path and is connected to it. In this chamber a screw is mounted, which is driven by the corresponding motor and is arranged horizontally between two of the walls of the chamber. In addition, the chamber opens laterally into a downwardly sloping channel, the lower end of which opens into the open. It is the The snail's task is to stir the material falling from the draw-off section and to convey it to the sloping channel. The open lower edge of this sloping channel has an adjustable opening. The negative pressure prevailing in the extraction section causes air to form through the inclined channel to the extraction section, which is adjustable depending on the opening of the door. This air flow in turn takes the lighter particles up to the distance mentioned. By adjusting the closable opening of the lower end of the inclined channel, the amount of air that reaches the discharge section can be varied so that the suction force of this air is sufficient to return the less heavy particles to the discharge section. These light particles correspond to the fermented organic product, while the heavier particles fall from the lower end of the tube, from where they are released to the outside.

With this device you can easily and safely remove heavy objects and particles such as earth, stones, glass, metal objects, etc.

The draw-off section can open into a funnel behind the separation chamber, from which the product is also conveyed via a pneumatic line to a mill in which the particle size is reduced. This process is facilitated by the absence of foreign bodies which have been removed by the sieve and the separation chamber, and by the state in which the material is after fermentation and which enables an easy grinding process.

From the exit of the mill there is a pipe that conveys the product to a sieve, where the larger particles are separated. From there, the product arrives at a cyclone, where a powdery product is obtained, which due to its properties can be used as an inflatable fuel. The remaining part of the product, which consists of the larger particles, is sent to a briquetting machine, which is used to produce solid, compact bodies which are easy to handle and can be used as fuel.

The invention will be more readily understood from the following description based on the accompanying drawings, in which a tray for carrying out the method is shown.

• Fig. 1 eine schematische Draufsicht auf eine Ausführungsform der erfindungsgemäßen Einrichtung;
• Fig. 2 ein Vertikalschnitt durch den Behälter, in dem die Fermentation stattfindet;
• Fig. 3 ein Schnitt durch die Extraktionsstrecke auf der Linie III-III in Fig. 1;
• Fig. 4 ein Schnitt auf der Linie IU-IU in F_ig. 3.

In the drawings

• Figure 1 is a schematic plan view of an embodiment of the device according to the invention.
• Figure 2 is a vertical section through the container in which the fermentation takes place.
• 3 shows a section through the extraction section on the line III-III in FIG. 1;
• Fig. 4 is a section on the line IU-IU in F _i g. 3rd

The device shown in the drawings is constructed so that the three fermentation steps take place in the same container. However, as has already been said, these fermentation steps can also be carried out separately in different containers, the first and at least part of the second or all of them taking place together in the open air. The mass from which the filter support is made forms piles of a suitable height, into which both the entry of air for the aerobic fermentation steps and the exit of gases from the anoerobic fermentation can be carried out with the help of pipes that are to a reasonable depth in the said heaps are introduced. In this case, the contamination residues to be cleaned are added to the heaps mentioned in the most appropriate fermentation step.

As can be seen from Fig. 1, the device has a cylindrical container 1 with a vertical axis, in which the three fermentation steps are carried out. The feeding of the organic material that forms the filter carrier is carried out by means of a cup conveyor ² , whereby of course any other loading device could also be used. The material of organic origin from a storage area comes into a metering device 3, from which a conveyor belt 4 extends, from which the mill 5 is fed. The metering device 3 controls the amount that reaches the mill 5 so that there are no blockages. The mill 5 has the task of carrying out a rough grinding process in order to break large parts. If, for example, all or part of the material of organic origin comes from waste, the mill serves to shred garbage bags, boxes, bottles, etc.

The product passes from the mill 5 to a sieve or a separating device 6, where only large objects made of plastic, metal, glass, etc. are separated. The separated articles exit through 7, while the rest of the product is poured onto conveyor 2. This conveyor can open into a chamber 8, from where the product reaches the container 1 over a distance 9.

The container 1 has, as can be seen better from FIG. 2, a cylindrical wall 10 which is lined with a material which cannot be attacked or destroyed by the fermentation. A cap 11 is provided at the top while the lower end is open. The cover 11 has a material loading device, for example a cyclone 12, to which the loading section 9 extends. The container 1 is mounted on a support frame or outer feet 13. A base 14 is provided under the container, which can consist of concrete or iron and from which the lower edge of the wall 10 is arranged at a slight distance. In the central part of the base 14, an outlet opening 15 is provided, from which a pneumatic discharge section 16 extends, which leads radially outwards.

A vertical central tube 17 is arranged in the container, which is suspended, for example, by means of tie rods 18, the tube starting at the top from a point which is above the highest level that the filter support reaches, and the tube ends below the outlet opening 15. The upper one The end of the tube 17 can be provided with a cover 19 which prevents the entry of the material which is fed by the cyclone 12. This tube can have openings 20 along its entire length, which are protected at the top by means of baffles 21 which prevent the entry of material from the filter carrier and serve to suck in the gases and vapors which form during each fermentation step. If these gases are to be used, vertical discharge lines 22 are provided which exit through the cover 11 and extend from the region 26 which corresponds to the anaerobic fermentation step.

As has already been said, there are transition zones between the three fermentation steps. However, to simplify the description, the three zones in which the three fermentation steps take place are shown with the aid of dividing lines 23 and 24 which delimit the upper zone 25 for the first aerobic fermentation step. The middle zone 26 corresponds to the second, anaerobic fermentation step, and the lower zone 27 corresponds to the third, also aerobic fermentation step.

Vertical conduits 28 are also provided for air access to zones 25 and 27. These lines have radial openings. in the wall areas that lead over zones 25 and 27. The lines 22 have openings in the area that extends over the zone 26.

Between the lower edge of the wall 10 of the container and the base 14 there is a radial screw 29, the function of which is to move the filter mass which is present at the end of the third fermentation step 27 to the middle one Transport outlet 15. The worm 29 is driven externally by a motor group 30 and rests with its inner end in a rotary bearing 31. The motor 30 is arranged by means of wheels or any other device above a gear 32 which is mounted between the feet 13 of the container and the base 14 . The motor group moves over the gear so that it gives the screw 29 not only a rotational movement but also an angular displacement with which the screw 29 attacks the fermentation product from the third zone 27 over its entire cross section. The motor which causes the motor group 32 to move is below a predetermined value, so that if the worm finds strong resistance when it is attacked, which prevents the angular movement from continuing, it only rotates and thereby attacks the resistant front side for so long. until the angular movement can be continued.

This effect can be achieved, for example, in that the gear disks of the motor group slide on the track 32 when the resistance which the screw encounters during its angular movement exceeds a certain value.

The inner bearing 31 of the screw is arranged so that it does not form an obstacle to the exit through the central outlet opening 15 thanks to the air flow that is formed between the middle tube and the pneumatic suction.

In the draw-off section 16, FIG. 1, a separation device for heavy particles 33 is arranged which, as can be seen from FIGS. 3 and 4, consists of a chamber 34 which is arranged below the section 16 and with it via an opening 35 is related, the size of which by means of a Sliding door 36 can be varied. A horizontal screw 37 is provided in the chamber 34, which runs in the transverse direction with respect to the draw-off section 16 and is actuated by a motor group 38. The chamber 34 opens into a lower oblique line 39, which is open at its lower end 40 and has an adjustable door 41 there, which can be actuated, for example, by a mechanism 42.

In the same street 16, FIG. 1, a fan 43 is arranged behind the particle separator 33, the suction of which acts over the distance 16 starting from the outlet opening 15 in FIG. 2.

The suction creates a negative pressure in the line, with which the material displaced by the screw 29 is sucked up to the opening 15. In addition, the suction creates an air inlet through line 17 and the opening which is created by the screw itself during its work, thus avoiding the air flow which could cause blockages at the outlet opening 15. The suction generated by line 17 ensures that air enters through the upper cyclone 12.

At the same time, it can be said with reference to FIGS. 3 and 4 that the negative pressure in the line 16 ensures that an air entry occurs through the opening 40, the intensity of which depends on the degree of opening of the door 41.

The material drawn through line 16 falls into chamber 34 as soon as door 36 is open. The screw 37 stirs the products and at the same time moves them to the inclined line 39. The opening of the door 41 is regulated in such a way that the air flow entering through the outlet opening 40 takes the less heavy particles to the line 16 so that they continue their path while the heavier parts such as stones, metal objects, glass, etc. fall onto the door 41, from where they fall into the open through the opening and closing thereof.

The section 16 opens behind the fan 43 at a mill 44 with which the fermented material is comminuted to the desired grain size. This process is facilitated by the reduced consistency of the particles after their fermentation. The ground material can then pass through a sieve and then through a drying chamber 45, in the oven of which, for example, some of the residues previously separated can burn. It should be noted that the moisture level of the material is very reduced at this point, since steam has already been removed by the temperature which prevails in the material during the various fermentation steps.

The dried product can then be stored in a silo 47, from which it is sucked off by means of a pneumatic conveyor with blower 48 and sent to a cyclone 49, from which a powder with a very fine grain size is obtained, which can be sent in a combustion chamber, the powder being stored in the silo 50. At the same time, a product of larger grain size is obtained, which is conveyed to a briquetting system 51, with which compact solid materials which are easy to handle and which are an excellent fuel for many fields of application are formed from the product. These bodies are sent from the output of the briquetting system, for example, via a belt 52 to a storage zone 53.

It can be seen that the device can be supplemented with silos at the points at which storage seems expedient. Two parallel containers 1 could also be provided, which can be controlled by the same loading and unloading device.

In the vicinity of the container 1, the store 54 is arranged, which contains the residues to be treated, which are sent to the container 1 via a pipeline 55. These residues, when fed to the first fermentation step, can be mixed with the material that forms the filter body. This process takes place at the entrance 12 of the container 1 and before entering the container. When the residues are fed to the second fermentation step, the necessary tubes for the feed of the residues are provided by the container 1, whereby the tube 22 in FIG. 2 can also be used for this.

The tubes 22 or a part of them in Fig. 2 can be extended downwards with an inclined path which passes through the wall 10 of the container, so that the liquids which can flow off in the zone 26 of the anaerobic fermentation. On the other hand, these tubes can also be closed at the lower end so that the liquids can be collected and later suctioned off.

Having described the nature of the invention and the manner in which it can be practiced, it will be appreciated that the details of the arrangements set forth above may be changed without changing the basic principle.

Claims (16)

1. A method for cleaning dirt residues, in particular gaseous, liquid and pasty residues, characterized in that the residues are sent through a biological filter which consists of a filter carrier based on a mass of organic origin with various stages of accelerated fermentation, which means Cultures of microorganisms are triggered, which are resistant to the residues to be treated and can cause the decomposition of the residues and the filter carrier into non-harmful solid products, gaseous and liquid products, the filter carrier having three different fermentation steps, of which the first and the third step represent an aerobic fermentation, these fermentation steps being controlled by supplying light to the sections for the first and third fermentation steps and gases and liquids being drawn off from the second section to adjust the height of each section and the temperature and humidity conditions that activate the process, the renewal of the mass that forms the filter body by suction of the decomposed mass and the harmless solid products of the residues that are carried away by the mass in the end of the third fermentation step, while new mass is introduced at the beginning of the first fermentation section in such a way that said mass and the residues to be removed gradually pass through the various fermentation steps, this renewal completely decomposing the residues and maintaining the living conditions for the microorganisms in the three fermentation sections in the filter carrier. 2. The method according to claim 1, characterized in that the residues to be treated are introduced into the first fermentation section. 3. The method according to claim 1, characterized in that the residues to be treated are introduced into the second, fermentation section. 4. The method according to claim 1, characterized in that the first and the third fermentation section have gas outlets directly connected to the atmosphere. 5. The method according to claim 1, characterized in that the gases drawn off from the second fermentation section or step are passed to a combustion chamber or processed for later combustion. 6. The method according to claim 1, characterized in that between the sections corresponding to the three fermentation steps, transition zones are located, in which the states between the values corresponding to the adjacent steps change gradually. 7. The method according to claim 1, characterized in that the liquid products from the second fermentation step partially in gaseous form together with the gases originating from this step and partially in liquid form or are suctioned off. i 8. The method according to claim 1, characterized in that the three fermentation steps are carried out in a single container, in which the first and third steps take place at the two outer ends of the container, while the second step is carried out in the central part thereof. 9. The method according to claim 1, characterized in that the three fermentation steps are carried out in independent containers. 10. The method according to claim 1, characterized in that at least the first fermentation step is carried out in the open air. 11. The method according to claim 10, characterized in that the first fermentation step and at least part of the second fermentation step take place in the open air. 12. A device for carrying out the method according to claims 1 to 11, consisting of a container for a filter carrier, a loading device for loading the container and a discharge device for the harmless solid products that result from the fermentation, characterized in that the container ( 1) is open at its lower end, under which a support base for the filter carrier is arranged, which is arranged at a short distance from the lower edge of the wall (10) of the container (1) that through the interior of the container a series of tubes (17, 22), which are open at the upper end to the outside, while at the lower end one of the tubes (17) is open, which runs through the central part of the container, and the, open end near the support base is that the rest of the pipes are open at different points on the support base, which are at the level of the various fermentation steps, the tubes which go to the corresponding sections of the aerobic fermentation and the central tube (1) for the air inlet, while the tubes (22) which correspond to those of the anaerobic fermentation Reach height, serve for the exit of gases, vapors and liquids, that the extraction device consists of a radial screw (29), which is arranged under the open lower base of the container and moves the product to the center, where a central outlet opening (15th ) is provided, around which the screw moves angularly, the central tube (17) ending immediately above the outlet opening and below the outlet opening a pneumatic extraction section (16) with a suction effect which emits the product conveyed by the screw (-29) transported and in which a separator (33) for heavy particles is mounted, which consists of one under the pneumatic Discharge path arranged chamber (34), which is connected to the path (16) and in which a screw (37) is arranged, which is controlled by the corresponding motor (38), that from the chamber (34) laterally after below, oblique and open at the bottom channel (39, 40) and the screw (37) stirs the products fallen from the draw-off section (16) and conveys them to the inclined channel, the oblique channel (39) at its open end ( 40) has an adjustable door (41) with which the amount of incoming air can be changed, the entry of which is attributable to the negative pressure created by the suction in the route, such that the suction force for this air is sufficient by the less conveying heavy particles back to the discharge path, but not enough to take the heavier particles with them, which then fall through the end of the tube. 13. The device according to claim 12, characterized in that the container rests on outer supports (13) which end in the vicinity of the container and are radially far enough away from this to accommodate the drive for the screw that below the Container is provided a support base for the filter carrier, which is so far from the wall of the container that the screw (29) can be carried out, the central outlet opening (15) being provided in the central part of this support base. 14. Device according to claim 13, characterized in that the screw (29) rests with its inner end on a rotary bearing which is arranged in the central part of the outlet opening and between the outlet opening (15) and the mouth of the central vertical tube (17th ) without forming an obstacle to falling product, while its outer end is connected to a drive (30) which ensures the rotation and angular movement of the screw, the double motor for the lower angular feed with a certain value triggers such that the screw only rotates as soon as the resistance to the feed exceeds a certain value. 15. The device according to claim 14, characterized in that the drive (30) of the screw (29) is arranged outside the support base, the mechanism ending via a roller element on a path that surrounds the base and over the length of which it moves and taking the snail with it. 16. The device according to claim 12, characterized in that at least a portion of the tubes, which extend up to the height corresponding to the anaerobic fermentation, is extended downward in the form of an inclined channel which penetrates the side of the wall of the container so that the liquid products can drain off or be extracted.

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